If your friends are movie-fans you might even go to cinema more than once.

If you question is there to justify doing stuff with buddies: if you want to talk about movies you just saw then you might think of going to a bar / diner afterwards. Just for some chit chat / small talk.

Of course you should not invite others to the movies every week ... It should be done on a semi-regular interval...so others might have a chance to invite too.

Also an option is to talk about trailers..and if one of the goers wants to watch xyz...or why not. So you can arrange the next visit pretty quick.